Preparing for Stove pipe Installation
Safety precautions
Before starting the installation process, it's crucial to take safety precautions seriously. Ensure you have fire-resistant materials, work gloves, safety goggles, and a fire extinguisher nearby.
Gathering necessary tools and materials
Make a list of all the tools and materials you'll need for the installation. This may include a drill, screws, stove pipe sections, chimney adapter, elbow joints, and high-temperature sealant.
Measuring and planning
Measure the distance between the stove's flue collar and the chimney or flue opening. Plan the installation path, considering any obstacles or obstructions that might be in the way.
Regulations
Single wall pipes should only be used as a connecting piece between your stove and the chimney stack.
Stove pipes should never pass through walls, ceilings, floors or windows. Other products should be used for this purpose, such as the twin wall flues. You must also be sure you convert from single wall stove pipe to twin wall flue pipe at least 150mm before passing through a noncombustable wall or ceiling.
Safety distance
Your 5″ flue pipe should be 15″ away from combustibles and your 6″ flue pipe should be 18″ away from combustibles in any direction.
Bends
Avoid bends in your chimney if possible; the fewer bends, the better the upwards draft will be. UK Building Regulations and HETAS recommend no more than four 45-degree bends in any one system.
When installing a wood stove flue, remember that the higher the chimney, the better the draft will be.
The ideal flue assembly is one that rises straight up from the appliance flue collar and directly into the chimney with no elbows. The system can include inspection panels to allow easy access.
A straight flue assembly offers the least restriction to gas flow and results in a stronger draft. Straight assemblies also need less maintenance because there are no corners for creosote deposits to accumulate. A perfectly straight stove pipe assembly is another good reason to install chimneys up through the warm space of the house, instead of out, up, and outside the wall.
Diameter
The (inner) diameter of your stove pipe is usually the same size as the flue collar on your stove. Follow manufacturer recommendations whenever applicable. Never use a chimney that is smaller in diameter than the flue size of the appliance it is being connected to. An improperly sized chimney results in excessive creosote formation and poor draft.
Be sure to install a chimney cowl to prevent animals and rain from entering the chimney and to improve the upwards draft.
Problems to avoid
Retrofitting an old chimney
Old chimneys are often too big for today's wood stoves. In that case, the amount of air they draw is not proportional to the amount of heat the stove produces - you will burn more wood than you need, and likely spend more time than necessary on fire maintenance.
Setting the stovepipe to the minimum height
A short chimney may not supply an optimal draft to the stove. Work with us to figure out the right stovepipe height for your stove.
Running too much horizontal stovepipe
A flue works best when it's vertical. Do not run stovepipe out windows or through walls.
Running the stovepipe along an exterior wall:
The stove will heat more of the house if the pipe travels up along an interior wall. Twin wall flue pipes can be used for outside.
Creating too many twists and turns
Flue pipe systems should be direct and straight.
What Is an Ideal Flue Pipe Assembly?
The ideal flue assembly is one that rises straight up from the appliance flue collar and directly into the chimney with no elbows. The system can include inspection panels to allow easy access.
A straight flue assembly offers the least restriction to gas flow and results in a stronger draft. Straight assemblies also need less maintenance because there are no corners for creosote deposits to accumulate. A perfectly straight stove pipe assembly is another good reason to install chimneys up through the warm space of the house instead of out, up, and outside the wall.
The (inner) diameter of your stove pipe is usually the same size as the flue collar on your stove. Follow manufacturer recommendations whenever applicable. Never use a chimney that is smaller in diameter than the flue size of the appliance it is being connected to. An improperly sized chimney results in excessive creosote formation and poor draft.
According to the building regulations, the single skin flue must terminate at least 45cm below combustible ceilings and the flue must be three times it's diameter away from combustible materials - i.e., for a 150mm single skin flue pipe you must have a 450mm circle around the centre line of the flue in which there are no combustible materials. You must also be sure you convert from single wall stove pipe to twin wall flue pipe at least 150mm before passing through a non-combustable wall or ceiling.
Safety distance to flammable material
The safety distance is 3 x the diameter of the pipe, unless the combustible material is shielded (with an airspace of 12mm between shield and combustible wall).
Final Thoughts
Installing a wood-burning stove pipe is both fairly simple and quite complex. If you'd like expert advice on your particular installation, feel free to contact us. We have all the products you'll need and will be more than happy to assist you.
Safety guidelines
Where it is not possible to construct a vertical chimney, no bends of more than 45 degrees should be used. A maximum of four bends (2 offsets) is permitted. The only exception is a short horizontal pipe (max 150 mm diameter) to connect the stove to a stone chimney.
Single wall pipes should be at least three times its internal diameter from combustible materials.
Conclusion
Installing a stove pipe may seem intimidating, but with the right tools, knowledge, and safety precautions, it can be a manageable task. By following this step-by-step guide and ensuring proper ventilation and maintenance, you can enjoy the warmth and comfort of your wood-burning or multi-fuel stove without worries.
